So, since it is a rockcrawler, it will be a homemade setup with the factory MAF? Measure the O.D. (outter diameter) of the TB. Then take the MAF with you to Home Depot and match it up with black plastic couplers in the plumbing section. As for the cone filter, take the MAF with you to a performance shop that sells a lot of filters--ask the manager if you can start opening boxes and see which one fits on the MAF... I know that is the redneck way to do it, but it is the best and fastest way to get it done. No down time for people to call you back, no shipping down times, etc.